USHAKOVA, E. P. Alternative Boundedness Characteristics for the Hardy–Steklov Operator. Eurasian Mathematical Journal, [S. l.], v. 8, n. 2, p. 74–96, 2017. Disponível em: https://emj.enu.kz/index.php/main/article/view/664. Acesso em: 4 jan. 2026.